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自1836年继电器问世，人们就开始用导线将它同开关器件巧妙地连接，构成用途各异的逻辑控制或顺序控制。至今，在PLC的编程语言——梯形图中还可以看到这些布线的影子。直到60年代末、70年代初可编程控制器问世，随着微电子技术、计算机技术和数据通信技术的飞速发展，以及微处理器的出现，PLC产品朝小型和**小型化方面进行了一次飞跃，终使早期的PLC从初的逻辑控制、顺序控制，发展成为具有逻辑判断、定时、计数、记忆和算术运算、数据处理、联网通信及PID回路调节等功能的现代PLC。
逻辑控制：PLC具有与、或、非、异或和触发器等逻辑运算功能，可以代替继电器进行开关量控制。
定时控制：它为用户提供了若干个电子定时器，用户可自行设定：接通延时、关断延时和定时脉冲等方式。
METACOMP VMEcomm20 VME MODULE
Motorola VME MVME 187-02A MVME187-02A Single Board
Motorola VME MVME 187-035A MVME187-035A Single Board
Motorola VME MVME 187 MVME187 Single Board Computer
HP A4511 VME 744 board w/ 256MB A600 Memory module
Applied Microsystems 700-10463-03 Communications VME Bd
Aleen VME 4000 2 Port Voicemail
Aleen VME 4000 4 Port Voicemail
HP A4511A w/option 120 onboard graphics VME 744/165L
DATACUBE VME MaxVideo 200 48mb w/Miniwarper - NEW
HP 64708A 64708-66505 VME Card A-3345-09 68030 analyzer
10332-12400 VME BOARD MI-6 STAUBLI 10332-12410
Harris Teltronics card CPU-VME 763612 refurb, warranty
Motorola VME MVME 338 MVME338 Single Board Computer
MOTOROLA VME MVME162-23 MVME 162-23 singel Board
Motorola VME MVME162-533 MVME 162-533 SINGLE BOARD
HP 64700A 64700-66515 VME Card A-3405-09 68040 analyzer
Motorola VME MVME162-533 MVME 162-533A SINGEL BOARD
MOTOROLA VME MVME172P-344SE MVME 172P-344SE
Motorola VME MVME 162-012A MVME162-012A Single Board
Jasper Kaparel Rittal cPCI VME 3U 200W DC RoHS PSU NIB
DPCI204-1022 - Power Supply - 150+ PCS - NEW - NIB
ASM EPI Reactor Control Module Motorola MVME 162 VME
Epitaxy E3000 Mecca MVME VME Control Mainframe
HP 9000 748/165L Workstation A4513A A4511A HP VME Unix
TELKOOR Kaparel Rittal cPCI VME 6U 500W DC Power Supply
Switching Power cPCI VME 600W DC Power Supply HDX-600Q
SIEMENS MODAC VME 10 SLOT DC12 PISA12U VM30 CON2-1
Heurikon Baja R4700 MVME VME
Bustronic/Motorola/Mizar 7122 CPU VME Test/Main Board
Elma 21 slot VME64X VME MVME PCI Rackmount Chassis
VME 9 Slot Monolithic Backplane 101VMEM109
MOTOROLA MVME 332XT VME MAINFRAME CARD BOARD=)
Heurikon Malibu Single CPU VME Mainframe Computer Board
MOTOROLA MVME 332XT Rev B VME MAINFRAME CARD BOARD
LTX VME Board [865-2625-00] Used
Barco Barcoview IVS 4600 VME Graphics HP 9000 748i 743i
MOTOROLA MVME MM-6346 VME 64MB EXPANSION BOARD.